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2. Earplug - Wikipedia

   en.wikipedia.org/wiki/Earplug

   Pushing in earplugs into the external ear canal may cause the air pressure to rise in it, in effect pushing against the eardrum and causing pain. This may be caused by pressure on the ear while lying down on the side, and is also the case when completely expanded foam earplugs are pushed further into the ear.

3. Ear clearing - Wikipedia

   en.wikipedia.org/wiki/Ear_clearing

   Diver clearing ears Section of the human ear, the Eustachian tube is shown in colour. Ear clearing, clearing the ears or equalization is any of various maneuvers to equalize the pressure in the middle ear with the outside pressure, by letting air enter along the Eustachian tubes, as this does not always happen automatically when the pressure in the middle ear is lower than the outside pressure.

4. Hearing protection device - Wikipedia

   en.wikipedia.org/wiki/Hearing_protection_device

   Earmuffs, external: This ear protection fits snug around the person's external ear. Earplugs, internal: These are ear protection that fit inside of the person's ear canal. There are many different types of ear plugs. The most commonly known are foam, musician, or custom earplugs that are made from a mold of a person's ear.

5. Frenzel maneuver - Wikipedia

   en.wikipedia.org/wiki/Frenzel_maneuver

   The Frenzel Maneuver is named after Hermann Frenzel (German ear, nose and throat physician and Luftwaffe commander). The maneuver was developed in 1938 and originally was taught to dive bomber pilots during World War II. The maneuver is used to equalize pressure in the middle ear.

6. Why do my ears feel clogged? 5 Things you can do right now. - AOL

   www.aol.com/why-ears-feel-clogged-5-000000206.html

   A healthy middle ear is filled with air, not fluid. Having fluid in there can be uncomfortable, serve as a breeding ground for infection, and not to mention cause a lot of pressure and pain in the ...

7. Valsalva maneuver - Wikipedia

   en.wikipedia.org/wiki/Valsalva_maneuver

   Variations of the maneuver can be used either in medical examination as a test of cardiac function and autonomic nervous control of the heart, or to clear the ears and sinuses (that is, to equalize pressure between them) when ambient pressure changes, as in scuba diving, hyperbaric oxygen therapy, or air travel.